Method of providing an emergency alert service via a mobile broadcasting and apparatus therefor

ABSTRACT

A device providing an emergency alert service via a mobile broadcasting according to one embodiment of the present invention includes an RS frame encoder configured to generate an RS frame, which is a 2nd dimensional data frame, in a manner of performing an RS (Reed-Solomon)-CRC (Cyclic Redundancy Check) encoding on an ensemble comprising a mobile data for a mobile broadcasting service and a service signaling channel containing an access information on the mobile broadcasting service, an RS frame divider configured to divide the generated RS frame into a plurality of RS frame portions, a signaling encoder configured to generate a signaling data comprising a TPC (Transmission Parameter Channel) for signaling a transmission parameter of the mobile broadcasting and a FIC (Fast Information Channel) containing a connection information between the ensemble and the broadcasting service, a data group formatter configured to generate a data group containing a part of the signaling data and the RS frame portion, and a broadcasting signal generating unit configured to generate a mobile broadcasting signal containing the data group.

This is a Continuation Application of application Ser. No. 15/336,560,filed Oct. 27, 2016, which is a Continuation of application Ser. No.14/962,737, filed Dec. 8, 2015, which is a Continuation of applicationSer. No. 13/875,838, filed on May 2, 2013, which is a Continuation ofapplication Ser. No. 13/882,940 filed on May 1, 2013, and claimspriority of 35 USC § 371 National Stage entry of InternationalApplication No. PCT/KR2013/000755 filed on Jan. 30, 2013 and U.S.Provisional Application No. 61/605,769 filed on Mar. 2, 2012; 61/617,654filed on Mar. 29, 2012 and 61/643,354 filed on May 7, 2012, all of whichare incorporated by reference in their entirety herein.

TECHNICAL FIELD

The present invention relates to a mobile broadcasting system, and moreparticularly, to a method of providing an emergency alert service via amobile broadcasting system and apparatus therefor.

BACKGROUND ART

According to a development of a portable device, transmission/receptionof broadcasting in a mobile device becomes available. Hence, abroadcasting signal transmission system suitable for a mobilebroadcasting environment is being constructed. Moreover, an artificialor natural disaster is globally taking place. Regarding the disaster, itis necessary to promptly provide the corresponding disaster information.In case of a mobile broadcasting, since a location of which a userreceives the broadcasting may vary and a disaster highly correlates withthe location, it is effective to provide the information on the disastervia the mobile broadcasting. Yet, a technology for providing informationon the disaster is not developed yet in a current mobile broadcastingsystem.

DISCLOSURE OF THE INVENTION Technical Task

A technical task that the present invention intends to achieve is tosolve the aforementioned problem, i.e., to provide an emergency alertservice in a mobile broadcasting system.

Technical Solution

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, accordingto one embodiment a method of providing an emergency alert service via amobile broadcasting includes the steps of generating an RS frame, whichis a 2^(nd) dimensional data frame, in a manner of performing an RS(Reed-Solomon)-CRC (Cyclic Redundancy Check) encoding on an ensemblecomprising a mobile data for a mobile broadcasting service and a servicesignaling channel containing an access information on the mobilebroadcasting service, dividing the generated RS frame into a pluralityof RS frame portions, generating a signaling data comprising a TPC(Transmission Parameter Channel) for signaling a transmission parameterof the mobile broadcasting and a FIC (Fast Information Channel)containing a connection information between the ensemble and thebroadcasting service, generating a data group containing a part of thesignaling data and the RS frame portion, and generating a mobilebroadcasting signal containing the data group, wherein the servicesignaling channel includes a service map table containing a propertyinformation on a mobile service transmitted by the ensemble and a mobileemergency alert table containing an information for transmitting anemergency alert service to the mobile broadcasting and wherein themobile emergency alert table includes an emergency alert messagetransmission type field indicating a scheme of transmitting theemergency alert message.

Preferably, the emergency alert message transmission type fieldindicates the emergency alert message transmitted in a manner of beingincluded in the mobile emergency alert table or transmitted via an IPdatagram.

Preferably, the mobile emergency alert table further includes anautomatic tuning channel number field indicating a physical RF channelnumber to perform an automatic tuning to a physical RF channel providingthe emergency alert service.

Preferably, the mobile emergency alert table further includes anemergency alert responder type field indicating a reception responder ofthe emergency alert message.

Preferably, the mobile emergency alert table further includes anemergency situation type field identifying an emergency situation, whichbecomes a target of the emergency alert.

Preferably, the mobile emergency alert table further includes an NRTservice identifier field identifying an NRT service providing anadditional information related to the emergency alert message.

Preferably, the FIC is transmitted in a manner of being included in thedata group in a form of a plurality of FIC segments, the FIC segmentincludes a FIC segment header and a FIC segment payload, and the FICsegment header includes a wake-up identifier field indicating whether amobile broadcasting receiver capable of performing a wake-up function toautomatically turn on the power and to provide the emergency alertmessage.

Preferably, the FIC includes a FIC header and a FIC payload and the FICpayload includes an EAT_ensemble_indicator field indicating whether themobile emergency alert table is transmitted via the service signalingchannel included in the ensemble, anMH_service_signaling_channel_version field indicating a versioninformation of the service signaling channel included in the ensemble,and a num_MH_services field indicating the number of the mobile servicetransmitted via the ensemble.

Preferably, the FIC header includes an EAS_wake_up_extended_info_Tagfield identifying whether a byte of an extended FIC header contains aninformation for a wake-up function and an EAS_wake_up_version_numberfield indicating the version information of the wake-up signaling.

To further achieve these and other advantages and in accordance with thepurpose of the present invention, according to one embodiment of thepresent invention a device providing an emergency alert service via amobile broadcasting includes an RS frame encoder configured to generatean RS frame, which is a 2^(nd) dimensional data frame, in a manner ofperforming an RS (Reed-Solomon)-CRC (Cyclic Redundancy Check) encodingon an ensemble comprising a mobile data for a mobile broadcastingservice and a service signaling channel containing an access informationon the mobile broadcasting service, an RS frame divider configured todivide the generated RS frame into a plurality of RS frame portions, asignaling encoder configured to generate a signaling data comprising aTPC (Transmission Parameter Channel) for signaling a transmissionparameter of the mobile broadcasting and a FIC (Fast InformationChannel) containing a connection information between the ensemble andthe broadcasting service, a data group formatter configured to generatea data group containing a part of the signaling data and the RS frameportion, and a broadcasting signal generating unit configured togenerate a mobile broadcasting signal containing the data group, whereinthe service signaling channel includes a service map table containing aproperty information on a mobile service transmitted by the ensemble anda mobile emergency alert table containing an information fortransmitting an emergency alert service to the mobile broadcasting andwherein the mobile emergency alert table includes an emergency alertmessage transmission type field indicating a scheme of transmitting theemergency alert message.

Advantageous Effects

According to the present invention, an emergency alert service can beprovided by a mobile broadcasting environment as well.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram of a transmission system according to one embodimentof the present invention;

FIG. 2 is a diagram of a signaling encoder according to one embodimentof the present invention;

FIG. 3 is a diagram of an ensemble structure according to one embodimentof the present invention;

FIG. 4 is a diagram of an emergency alert data processing using a mobileemergency alert table according to one embodiment of the presentinvention;

FIG. 5 is a diagram of a syntax of a mobile emergency alert tableaccording to one embodiment of the present invention;

FIG. 6 is a diagram for indicating the meaning of type_of_responderfield, type_of_disciplines field. EAS_message_transfer_type field,EAS_message_encoding_type field in accordance with each value accordingto one embodiment of the present invention;

FIG. 7 is a diagram of IP datagram syntax, in case that an emergencyalert message transmitted via the IP datagram is identified, accordingto one embodiment of the present invention;

FIG. 8 is a diagram of a syntax of a FIC segment header according to oneembodiment of the present invention;

FIG. 9 is a diagram of a syntax of a FIC chunk payload according to oneembodiment of the present invention;

FIG. 10 is a flowchart of data processing to perform a wake-up functionaccording to one embodiment of the present invention;

FIG. 11 is a diagram of a syntax of a FIC chunk header according to oneembodiment of the present invention;

FIG. 12 is a diagram of a procedure processing a version information ofa wake-up signaling via an extension of a FIC chunk header according toone embodiment of the present invention;

FIG. 13 is a diagram of a procedure processing an auto tuning to animportant emergency alert of a wake-up operation according to oneembodiment of the present invention;

FIG. 14 is a diagram of a FLUTE FDT (File Delivery Table) instanceaccording to one embodiment of the present invention;

FIG. 15 is a diagram of a TPC syntax for a wake-up signaling using a TPCaccording to a different embodiment of the present invention;

FIG. 16 is a diagram of a syntax of a FIC segment header according to adifferent embodiment of the present invention;

FIG. 17 is a diagram of an ESG content fragment according to a differentembodiment of the present invention;

FIG. 18 is a diagram of an emergency alert system according to oneembodiment of the present invention;

FIG. 19 is a diagram of a screen providing additional information of anemergency alert message using an NRT according to one embodiment of thepresent invention;

FIG. 20 is a diagram of a screen providing additional information of anemergency alert message using an NRT according to a different embodimentof the present invention;

FIG. 21 is a diagram of an UI of a mobile emergency alert systemaccording to one embodiment of the present invention;

FIG. 22 is a diagram of a syntax of a mobile emergency alert tableaccording to a different embodiment of the present invention;

FIG. 23 is a diagram of a definition for a value available to anevent_urgency field, an event_severity field, an event_certainty field,and an EAS_message_type field according to a different embodiment of thepresent invention;

FIG. 24 is a diagram of a mobile emergency alert table according to adifferent embodiment of the present invention;

FIG. 25 is a diagram of a mobile emergency alert table according to adifferent embodiment of the present invention;

FIG. 26 is a diagram of a descriptor to signal an emergency alertservice via an extension of SMT according to one embodiment of thepresent invention;

FIG. 27 is a diagram of a descriptor to signal an emergency alertservice according to a different embodiment of the present invention;

FIG. 28 is a diagram of a signaling to provide an emergency alertservice with one component according to one embodiment of the presentinvention;

FIG. 29 is a diagram of emergency_alert_IP_datagram( ) descriptor totransmit an emergency alert service according to one embodiment of thepresent invention;

FIG. 30 is a diagram of emergency_alert_IP_datagram ( ) descriptor totransmit an emergency alert service according to a different embodimentof the present invention;

FIG. 31 is a diagram of an ESG content fragment for an emergency alertservice according to a different embodiment of the present invention.

BEST MODE

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Yet, the present invention may be non-limited ornon-restricted by the embodiments.

Although terminologies used in the present specification are selectedfrom general terminologies used currently and widely in consideration offunctions, they may be changed in accordance with intentions oftechnicians engaged in the corresponding fields, customs, advents of newtechnologies and the like. Occasionally, some terminologies may bearbitrarily selected by the applicant(s). In this case, the meanings ofthe arbitrarily selected terminologies shall be described in thecorresponding part of the detailed description of the specification.Therefore, terminologies used in the present specification need to beconstrued based on the substantial meanings of the correspondingterminologies and the overall matters disclosed in the presentspecification rather than construed as simple names of theterminologies.

In the following description, a terminology and an abbreviation aredefined for the purpose of understanding and clarity of the presentinvention.

Among the terminologies used for detail explanation on the invention, amain service data corresponds to a data received by a fixed broadcastreceiving system and may be able to include an audio/video data. Moreparticularly, the main service data may be able to include a highdefinition (HD) or a standard definition (SD) audio/video data and maybe able to include various kinds of data for broadcasting.

A known data corresponds to a data known in advance according to anappointment between a broadcast receiving system and a broadcasttransmitting system.

A terminology ‘MH’ corresponds to the terminology of a mobile/handheldand corresponds to the opposite terminology of a fixed type system. Morespecifically, an MH service data (or a mobile service data) may be ableto include a certain kind of data used by a mobile or portable system.Hence, the mobile service data according to one embodiment of thepresent invention may be non-limited to the MH service data.

The mobile service data may be able to include such information as aprogram execution file or stock information. The mobile service data maybe able to include an audio/video data. More specifically, the mobileservice data may correspond to the audio/video data having a lowerresolution and lower data rate compared to the main service data. Forinstance, if an MPEG-2 codec is used as an audio/video codec for a mainservice, the audio/video codec having a higher image compression ratesuch as the MPEC-2 codec, an MPEC-4 advanced video coding (AVC), or ascalable video coding (SVC) can be used for a mobile service.

The mobile service data may be able to include a TPEG data (transportprotocol expert group data) for real time traffic broadcasting. Or, themobile service data may be able to include such a broadcastservice/program as a weather information service, a traffic informationservice, a stock information service, a viewer participating quizprogram, a real time election, a bidirectional education broadcastprogram, a game service, or a music program.

In the present invention, a data group (or an MH group) means a set ofdata packet transmitted via a data slot (or an MH slot).

A data group division indicates a set of data group region in a slot. Inthis case, the data group division can be classified into a primary datagroup division and a secondary data group division. A set of the primarydata group division in an MH frame forms a primary parade and thesecondary data group division forms a secondary parade.

A parade (or an MH parade) indicates a set of data group having anidentical FEC parameter. Or, the parade may indicate a set of data groupdivision of a data group having an identical data group type.

RS frame (Reed-Solomon Frame) is a 2 dimensional data frame. In thiscase, a payload of the RS frame is encoded by an RS-CRC (ReedSolomon-Cyclic Redundancy Check) coding.

Ensemble (MH ensemble) indicates a set of the RS frame to which anidentical FEC (Forward Error Correction) is applied. In this case, eachof the RS frames includes a set of IP stream in a manner of beingcompressed. The ensemble may be able to include a mobile service datafor a mobile service and a mobile service signaling channel for asignaling of the mobile service.

According to one embodiment of the present invention, the mobile servicedata for the mobile service can be transmitted on a part of atransmission channel configured to transmit a main service data of amain service. Or, the mobile service data for the mobile service can betransmitted on a whole of the transmission channel used for the mainservice. In this case, the data necessary for the mobile service can becalled the mobile service data. Hence, the mobile service data mayinclude a known data, a signaling data, and/or an RS parity data.

The mobile service data can be classified into the mobile service dataof a CMM (Core Mobile Mode) and the mobile service data of a SFCMM(Scalable Full Channel Mobile Mode).

The CMM is a broadcast mode configured to transmit the main service dataand the mobile service data together. As one example, the CMM may beable to use at least 38 packets out of 156 packets of each slot totransmit the main service data for a conventional broadcasting.

The SFCMM is the broadcast mode configured to transmit the mobileservice data only or configured to transmit the main service data lessthan the CMM and the mobile service data together. For instance, theSFCMM may be able to use less than 38 packets out of 156 packets of eachslot to transmit the main service data.

SFCMM parade indicates the parade capable of maintaining a backwardcompatibility with a legacy CMM system/decoder and the parade unable tobe recognized by the legacy CMM system/decoder.

The data group region indicates a set of a data block or an extensiondata block. The data group region indicates a prescribed region in adata group. Each data group region may include the mobile service dataof a different use.

TPC (Transmission Parameter Channel) can be included in each of the datagroups. TPC delivers the information on a data frame or a data group toa receiving side and provides a transmission parameter.

FIC (Fast information channel) transmits a cross layer information (orinter-layer information). The FIC may include a connection informationbetween an ensemble and a mobile service.

FIG. 1 is a diagram of a transmission system according to one embodimentof the present invention.

The transmission system according to one embodiment of the presentinvention includes a packet adjustment unit 101, a pre-processor 102, adata frame encoder 103, a block processor 104, a signaling encoder 105,a group formatter 106, a packet formatter 107, a packet multiplexer 108,a post-processor 109, a modified data randomizer 110, asystematic/non-systematic RS encoder 111, a data interleaver 112, anon-systematic RS encoder 113, a parity replacer 114, a modified trellisencoder 115, a synchronization multiplexer 116, a pilot inserter 117, aVSB modulator 118, and/or a transmission unit 119. The transmissionsystem according to the present invention may further include apre-equalizer filter 120.

The packet adjustment unit 101 may be able to compensate a positiondifference occurring between a service stream including a mobile servicestream and the service stream not including the mobile service stream.

The pre-processor 102 may be able to perform a role of forming a mobileservice data into a mobile service structure to transmit the mobileservice data. The pre-processor 102 may be able to perform an additionalFEC coding on the mobile service data. The pre-processor 102 may be ableto insert a known data into a data group. The pre-processor 102 enhancestransmission/reception performance of the mobile service data in amobile environment.

The pre-processor 102 may include a data frame encoder 103, a blockprocessor 104, a signaling encoder 105, a group formatter 106, a packetformatter 107 and/or a packet multiplexer 108.

The data frame encoder 103 randomizes a mobile service data and performsan RS encoding and a CRC (Cyclic Redundancy Check) encoding on themobile service data. The data frame encoder 103 generates an RS frameincluding the mobile service data. The data frame encoder 103 mayinclude an RS frame divider (not depicted) generating an RS frameportion by separating the RS frame.

The block processor 104 converts the RS frame portion into an SCCC(Serial Concatenated Convolutional Coding) block. The block processor104 converts a byte of the mobile service data included in the SCCCblock into the mobile service data by a bit unit. The block processor104 performs a convolutional coding of 1/2, 1/3, or 1/4 rate on themobile service data of bit unit. In this case, the 1/2 rate means thatone bit in, two bits out, the 1/3 rate means that one bit in, three bitsout, and the 1/4 rate means that one bit in, four bits out. Theoutputted bits are included in a symbol. The block processor 104performs an interleaving for the symbol outputted in a manner of beingconvolutional encoded. The block processor 104 converts the interleavedsymbol into a data of byte unit. The block processor 104 converts theSCCC block into a data block.

The signaling encoder 105 generates a signaling information for asignaling of a receiving side. The signaling encoder 105 performs a FECcoding and a PCCC (Parallel Concatenated Convolutional Code) encoding onthe signaling information. The signaling information includes a TPC dataand/or a FIC data.

The group formatter 106 forms a data group including a mobile servicedata. The group formatter 106 inserts a FCC coded mobile service datainto the data group of interleaved form. The group formatter 106 insertsan initialization data byte and/or a known data sequence (a set ofconsecutive known data), which is for initialization of a memory of themodified trellis encoder 115, into the data group. The group formatter106 inserts a position holder for a main service data, the positionholder for an MPEG-2 header, and/or the position holder for anon-systematic RS parity into the data group. The group formatter 106may be able to insert a dummy data to generate a data group of apreferable form. After inserting various kinds of data, the groupformatter 106 performs a de-interleaving for the data in the data groupof interleaved form. After the de-interleaving is performed, the datagroup is outputted in a form that the data group is not interleaved. Thedata group generated in the group formatter 106 includes the mobileservice data corresponding to one RS frame portion.

The packet formatter 107 converts an output data of the group formatter106 into a transport stream (TS) packet. In this case, the TS packet canbe called a mobile service data packet. The packet formatter 107 outputs(118+M) number of mobile service data packet for one data group. In thiscase, ‘M’ is an integer less than 38.

The packet multiplexer 108 multiplexes a packet including the mobileservice data processed by the pre-processor 102 and the packet includingthe main service data. In one slot, a multiplexed packet includes(118+M) number of mobile service data and ‘L’ number of main servicedata packet. ‘M’ is an integer greater than ‘0’ and less than 38. Oneembodiment of the present invention is that the total of ‘M’ and ‘L’corresponds to 38. As a different embodiment, in case that the number ofmain service data packet corresponds to ‘0’ (‘L’=0), the packetmultiplexer 108 processes the mobile service data only.

The post-processor 109 processes the mobile service data in order forthe mobile service data to have a backward compatibility with a legacybroadcasting system. In this process, the main service data can beprocesses together. According to one embodiment of the presentinvention, the post-processor 109 may include a modified data randomizer110, a systematic/non-systematic RS encoder 111, a data interleaver 112,a non-systematic RS encoder 113, a parity replacer 114, and/or amodified trellis encoder 115.

The modified data randomizer 110 does not perform a randomizing for themobile service data packet and bypasses the mobile service data packet.The modified data randomizer 110 performs the randomizing for the mainservice data packet. According to one embodiment of the presentinvention, in case that a data group generated in the pre-processor 102does not include the main service data, the modified data randomizer 110may not perform a randomizing process.

In case that an input data corresponds to the main service data packet,the systematic/non-systematic RS encoder 111 performs a systematic RSencoding on the main service data. In case that the input datacorresponds to the mobile service data packet, thesystematic/non-systematic RS encoder 111 performs a non-systematic RSencoding on the mobile service data. A systematic/non-systematic RSparity generated by the systematic/non-systematic RS encoding can beinserted into a pre-defined position in the data group. In case that themain service data packet is not included in the service data packet,which is multiplexed by the packet multiplexer 108, it is not necessaryfor the systematic/non-systematic RS encoder 111 to perform the RSencoding for the main service data. In this case, thesystematic/non-systematic RS encoder 111 may not generate thenon-systematic RS parity for the backward compatibility.

The data interleaver 112 performs an interleaving for the data includingthe main service data and the mobile service data.

If it is necessary to initialize the modified trellis encoder 115, thenon-systematic RS encoder 113 changes a initialization data of themobile service data to a memory value in a manner of receiving thememory value of the modified trellis encoder 115 and receiving themobile service data from the data interleaver 112. The non-systematic RSencoder 113 outputs an RS parity, which is generated by performing thenon-systematic RS encoding for the changed mobile service data, to theparity replacer 114.

If it is necessary to initialize the modified trellis encoder 115, theparity replacer 114 receives the mobile service data from the datainterleaver 112 and then replaces the non-systematic RS parity of themobile service data with the non-systematic RS parity generated by thenon-systematic RS encoder 113.

In case that a packet multiplexed by the multiplexer 108 does notinclude the main service data packet, it is not necessary to include theRS parity for backward compatibility in the data group. Hence, accordingto one embodiment of the present invention, in this case, thenon-systematic RS encoder 113 and the parity replacer 114 does notperform the aforementioned operations and may be then able to perform anoperation of bypassing a received data.

The modified trellis encoder 115 performs a trellis encoding for theoutput of the data interleaver 112. In order to output a known data in aform determined by a broadcast transmitting side and a broadcastreceiving side in advance after the trellis encoding, the memoryincluded in the trellis encoder 115 needs to be initialized beforebeginning the trellis encoding. The aforementioned initializationoperation can start by the initialization data included in the datagroup.

The synchronization multiplexer 116 inserts a field synchronizationsignal and a segment synchronization signal into the output data of themodified trellis encoder 115 and multiplexes the data.

The pilot inserter 117 receives the data multiplexed by thesynchronization multiplexer 116 and inserts a pilot signal, which isused as a carrier phase by a receiving side to demodulate a channelsignal, into the multiplexed data.

The VSB modulator 118 performs a VSB modulation to transmit a broadcastdata.

The transmission unit 119 performs a frequency upconverting for themodulated data and transmits the converted data.

FIG. 2 is a diagram of a signaling encoder according to one embodimentof the present invention.

The signaling encoder according to one embodiment of the presentinvention includes a 1^(st) RS encoder 2100, a 2^(nd) RS encoder 220, ablock interleaver 2300, a multiplexer 2400, a signal randomizer 2500,and/or a PCCC encoder 2600.

The 1^(st) RS encoder 2100 performs an RS encoding for TPC data.

The 2^(nd) RS encoder 2200 performs an RS encoding for FIC data.According to one embodiment of the present invention, the 1^(st) encoderand the 2^(nd) encoder perform the RS encoding with a rate differentfrom each other. In particular, the TPC data and the FIC data areencoded by the rate different from each other.

The block interleaver 2300 performs a block interleaving for the RSencoded FIC data. The block interleaving is to interleave the FIC databy a block unit.

The multiplexer 2400 multiplexes the RS encoded TPC data and the blockinterleaved FIC data.

The signal randomizer 2500 randomizes the multiplexed data.

The PCCC encoder 2600 performs a PCCC encoding for the randomized data.

FIG. 3 is a diagram of an ensemble structure according to one embodimentof the present invention.

The ensemble transmits a mobile service data composing a mobile service.The ensemble may include a service signaling channel (SSC) to signal themobile service. It is able to define that the service signaling channelis to be transmitted via a specific IP address and an UDP port. Inparticular, a receiving side may be able to obtain the service signalingdata in a manner of parsing the data of the corresponding IP address andthe UDP port.

The service signaling channel may include a Service Map Table (SMT)including property information on the mobile service transmitted by theensemble, a (Guide Access Table (GAT) including information on a serviceguide data of the mobile service, a Cell Information table (CIT)providing carrier frequency information of an adjacent cell transmittinga similar service, a Service Labeling Table (SLT) including informationfor a prompt mobile service scan of a receiving side, a Rating RegionTable (RRT) including information on a viewing rate for the mobileservice, and/or a mobile Emergency Alert Table-MH (EAT-MH) includinginformation for transmitting an emergency alert service to a mobilebroadcasting.

FIG. 4 is a diagram of an emergency alert data processing using a mobileemergency alert table according to one embodiment of the presentinvention.

According to one embodiment of the present invention, a CAP (CommonAlerting Protocol) alert message can be compressed to reduce a size ofthe mobile emergency alert table. A mobile receiver (M/H receiver)capable of identifying the mobile emergency alert table may be able toextract the compressed CAP alert message. In this case, the mobilereceiver decompresses the CAP alert message and may be then able topromptly display an emergency alert message in a state of not referencedby the SMT.

The mobile emergency alert table may be able to transmit NRT_service_idfor an entry of an emergency alert message. The NRT_service_id indicatesthat an additional content related to the emergency alert message istransmitted via an NRT (Non-Real-Time) broadcasting service. A broadcastreceiver capable of receiving the NRT broadcasting service may be ableto display an additional emergency alert message with reference to aFLUTE (File Delivery over Unidirectional Transport), which is signaledfor the SMT, a service guide (SG), and/or the NRT service.

The number of repeatedly receiving the mobile emergency alert table mayvary according to significance of the emergency alert message. Theemergency alert message of highest significance can be repeated on everyMH frame.

Referring to FIG. 4, a broadcasting receiver identifies an IP addressand UDP port number of a corresponding service in the SMT with referenceto MH_service_id of the GAT and parses a FLUTE data transmitted via theIP address and the UDP port. And, the broadcasting receiver may be thenable to display that there exists an emergency alert content via anElectronic Service Guide (ESG). The broadcasting receiver identifies anIP address and UDP port number transmitting a service including anemergency alert message transmitted to the NRT with reference toEAS_NRT_service_id of the mobile emergency alert table, parses the FLUTEdata transmitted via the IP address and the UDP port, and may be thenable to display the emergency alert message. Or, the mobile emergencyalert table may include the emergency alert message. In this case, thebroadcasting receiver may be able to directly display the emergencyalert message in a manner of parsing the emergency alert message via aCAP parser.

FIG. 5 is a diagram of a syntax of a mobile emergency alert tableaccording to one embodiment of the present invention.

The mobile emergency alert table of the present invention may include atable_id field, an EAT_MH_protocol_version field, an ensemble_id field,an automatic_tuning_channel_number field, an automatic_tuning_ts_idfield, automatic_tuning_ensemble_id field, anautomatic_tuning_service_id field, a num_EAS_messages field, anEAS_message_id filed, a type_of_responder field, a type_of_disciplinesfield, an EAS_IP_version_flag field, an EAS_message_transfer_type field,an EAS_message_encoding_type field, an EAS_message_length field, anEAS_message_byte field, and/or an EAS_NRT_service_id field.

The table_id field identifies a kind of current table. A broadcastingreceiver may be able to identify that the present table corresponds to amobile emergency alert table by identifying the table_id field of havinga specific value.

In case that a structure of a mobile emergency alert table is modified,the EAT_MH_protocol_version field identifies a version number of thetable.

The ensemble_id field indicates an ID of an ensemble related to thepresent table.

The automatic_tuning_channel_number field indicates a physical RFchannel number for an automatic tuning. For instance, if it is necessaryto tune to a channel number broadcasting an emergency alert message byforce, the automatic_tuning_channel_number field can be referred.

The automatic_tuning_ts_id field indicates a transport stream ID for anautomatic tuning. For instance, if it is necessary to parse a transportstream including an emergency alert message, a corresponding stream canbe identified by the automatic_tuning_ts_id field.

The automatic_tuning_ensemble_id field indicates an ensemble ID for anautomatic tuning. For instance, the ensemble including an emergencyalert message can be identified by the automatic_tuning_ensemble_idfield.

The automatic_tuning_service_id field indicates a target A/V service ofan automatic tuning. If the automatic tuning is designated in a mobileemergency alert table, the emergency alert table may or may not includean alert message. If the automatic tuning is designated, a broadcastingreceiver ignores a corresponding message and tunes to a target channelnumber.

The num_EAS_messages field indicates the number of emergency alertmessage included in a mobile emergency alert table.

The EAS_message_id filed identifies a unique ID for transmitting anemergency alert message. This field may change its value in case that aprevious emergency alert message is updated or cancelled. As a differentembodiment, this field can be extracted from a CAP message ID.

The type_of_responder field indicates a broadcasting responder of anemergency alert message.

The type_of_disciplines field indicates information on an emergencysituation, which becomes a target of an emergency alert.

The EAS_IP_version_flag field indicates that an IP_address fieldincludes an IPv4 address, if it is set to ‘0’. The EAS_IP_version_flagfield indicates that the IP_address field includes an IPv6 address, ifit is set to ‘1’.

The EAS_message_transfer_type field indicates a transfer type of anemergency alert message.

The EAS_message_encoding_type field indicates an encoding plan of anemergency alert message.

The EAS_message_length field indicates a compression length of acompressed emergency alert message including an emergency alert.

The EAS_message_byte field indicates a size of a compressed emergencyalert message including an emergency alert.

The EAS_NRT_service_id field identifies a service ID of an NRT serviceproviding an additional content related to an emergency alert message.This field can be inserted into the SMT included in an ensembletransmitting an emergency alert table as well.

FIG. 6 is a diagram indicating the meaning of type_of_responder field,type_of_disciplines field, EAS_message_transfer_type field,EAS_message_encoding_type field in accordance with each value accordingto one embodiment of the present invention.

The type_of_responder field may be able to indicate a case that aviewing target of an emergency alert message is not identified, a casethat the viewing target is not a public, or a case that the viewingtarget is the public according to the value of this field. Or, thetype_of_responder field may be able to indicate both the cases that theviewing target is/is not the public, according to the value of thisfield.

The type_of_disciplines field may be able to indicate a situation ofoccurrence of an emergency alert system, an explosion event, a firesituation, a dangerous material occurrence event, law enforcement, or alife-saving situation according to the value of this field.

The EAS_message_transfer_type field may be able to indicate a case thata transfer type of an emergency alert message is not identified, a casethat an NPT file not including an alert message is transmitted, a casethat an emergency alert message is transmitted in a manner of beingincluded in a mobile emergency alert table, or a case that an emergencyalert message is transmitted via an IP datagram according to the valueof this field.

The EAS_message_encoding_type field may be able to indicate a case thatan encoding plan is not identified, a case that an encoding (or acompression) for an emergency alert message was not performed, or a casethat an emergency alert message is compressed using gzip algorithmaccording to the value of this field.

FIG. 7 is a diagram of IP datagram syntax, in case that an emergencyalert message transmitted via the IP datagram is identified, accordingto one embodiment of the present invention.

The IP datagram may include an EAS_message_id field, anEAS_message_length field, and/or an EAS_message_bytes field.

The EAS_message_id field corresponds to a value of an entry of anemergency alert message in a mobile emergency alert table.

The EAS_message_length field indicates a length of each emergency alertmessage.

The EAS_message_bytes field indicates a size of a compressed emergencyalert message.

FIG. 8 is a diagram of a syntax of a FIC segment header according to oneembodiment of the present invention.

A mobile broadcasting receiver may operate in a standby mode and may beable to perform a response to an emergency alert message via a wake-upfunction. The mobile broadcasting receiver capable of performing thewake-up function does not provide a mobile service and may be able tomonitor a broadcasting signal transmitted from a broadcasting companyeven in the state of the standby mode.

The wake-up means to switch a mode of a broadcasting receiver from asleeping mode (or idle mode) to an active mode for an emergency alertmessage even in a case that the broadcasting receiver is currently inthe sleeping mode.

To consistently monitor a broadcast signal by a mobile broadcastingreceiver expedites battery consumption. Hence, a signaling to reduce thebattery consumption is necessary. Although a smallest unit for signalingin a mobile broadcasting service is a FIC segment header included in aFIC segment, it is necessary for the broadcasting receiver to receive atleast one RS frame to obtain the FIC segment. A change of a FIC Chunkcan be noticed by monitoring a TPC. For instance, if a value of aFIC_version field included in the TPC changes, it is able to know thereexist a change in the FIC Chunk. If a change is noticed in theFIC_version field of the TPC, the broadcasting receiver turns on thepower of the broadcasting receiver and receives an RS frame to gatherthe FIC segment. If there exists a wake-up signal in the FIC Chunk, awake-up indicator in the FIC segment header can be used to judge whetherthe mobile broadcasting receiver is woke up.

The FIC Chunk is transmitted in a manner of being divided into aplurality of FIC segment payloads. The FIC segment includes a FICsegment header and a FIC segment payload. The FIC segment is transmittedvia one data group.

The FIC segment header includes a FIC_segment_type field, awake_up_indicator field, a FIC_chunk_major_protocol_version field, acurrent_next_indicator field, an error_indicator field, aFIC_segment_num field, and/or a FIC_last_segment_num field.

The FIC_segment_type field indicates a kind of data transmitted by theFIC segment. The FIC_segment_type field may indicate that the FICsegment payload transmits a part of the FIC Chunk or indicate that theFIC segment payload does not include a meaningful data according to avalue of the field.

The wake_up_indicator field indicates whether a mobile broadcastingreceiver capable of performing a wake-up function automatically turnsthe power on and then provides an emergency alert message. For instance,the mobile broadcasting receiver can be controlled to ignore a wake-upprocess and then continuously perform a former function or to instantlyperform the wake-up function according to the value of thewake_up_indicator field.

The FIC_chunk_major_protocol_version field indicates a major protocolversion of the FIC Chunk partially transmitted by the FIC segment. Thisvalue can be set to an identical value of theFIC_chunk_major_protocol_version field included in the FIC Chunk header.

The current_next_indicator field indicates a current or a next state ofthe FIC Chunk partially transmitted by the FIC segment.

The error_indicator field indicates whether an error is detected in theFIC segment.

The FIC_segment_num field indicates the number of the FIC segment. Itmay be able to indicate that the FIC segment including the FIC segmentpayload included in the FIC Chunk is nth FIC segment.

The FIC_last_segment_num field indicates the number of the last ICsegment. It may be able to indicate that the last FIC segment among theFIC segment including the FIC segment payload included in the FIC Chunkis nth FIC segment.

FIG. 9 is a diagram of a syntax of a FIC Chunk payload according to oneembodiment of the present invention.

A mobile broadcasting receiver capable of performing a wake-up functionmay be monitoring the FIC_version field in the TPC. Having sensed achange of the FIC_version field, the mobile broadcasting receiver maystart an operation of gathering the FIC segment. If thewake_up_indicator field of the FIC segment header indicates that thewake-up function is needed to be performed, the mobile broadcastingreceiver may receive an ensemble including a mobile emergency alerttable in a service signaling channel. In this case, the correspondingensemble can be identified by an EAT_ensemble_indicator field.

The FIC Chunk payload includes an ensemble_id field, anensemble_protocol_version field, an SLT_ensemble_indicator field, aGAT_ensemble_indicator field, an EAT_ensemble_indicator field, anMH_service_signaling_channel_version field, a num_MH_services field, anMH_service_id field, a multi-ensemble_service field, anMH_service_status field, and/or an SP_indicator field.

The ensemble_id field identifies an ensemble signaled by a correspondingFIC.

The ensemble_protocol_version field indicates version information of anensemble structure.

The SLT_ensemble_indicator field indicates whether a signaling channelincluded in an ensemble includes a service labeling table.

The GAT_ensemble_indicator field indicates whether a signaling channelincluded in an ensemble includes a guide access table.

The EAT_ensemble_indicator field indicates whether a signaling channelincluded in an ensemble includes a mobile emergency alert table. Or, theEAT_ensemble_indicator field indicates that the mobile emergency alerttable is transmitted to a signaling stream of this ensemble.

The MH_service_signaling_channel_version field indicates a version of aservice signaling channel included in an ensemble.

The num_MH_services field indicates the number of MH service signaledvia an ensemble.

The MH_service_id field identifies an MH service.

The multi-ensemble_service field indicates whether an MH service istransmitted via more than one ensemble.

The MH_service_status field indicates whether an MH service is activatedand/or whether the MH service is hidden according to a value of theMH_service_status field.

The SP_indicator field indicates whether a service protection is appliedto at least one or more component configured to provide an MH service.

FIG. 10 is a flowchart of data processing to perform a wake-up functionaccording to one embodiment of the present invention.

The mobile broadcasting receiver monitors the FIC segment header or theTPC. If there is no change in the FIC_version field, the mobilebroadcasting receiver continuously performs the monitoring. If thereexist a change in the FIC_version field, the mobile broadcastingreceiver checks the FIC segment header [S10010]. If thewake_up_indicator field in the FIC segment header indicates that awake-up function is not performed, the mobile broadcasting receivercontinuously monitors the FIC segment header or the TPC. If thewake_up_indicator field indicates that the wake-up function is needed tobe performed, the mobile broadcasting receiver completes a FIC Chunk ina manner of gathering the FIC segment [S10030]. The mobile broadcastingreceiver checks the EAT_ensemble_indicator of the FIC Chunk payload[S10040]. If the EAT_ensemble_indicator indicates the ensembletransmitting the mobile emergency alert table [S10050], the mobilebroadcasting receiver starts to parse/decode on the correspondingensemble [S10060]. If an application is required to provide an emergencyalert message, the mobile broadcasting receiver may start theapplication [S10070]. The mobile broadcasting receiver obtains themobile emergency alert table from the corresponding ensemble [S10080],parses and displays the emergency alert message using the table[S10090]. Having completed the aforementioned process, the mobilebroadcasting receiver turns the power off [S10100].

FIG. 11 is a diagram of a syntax of a FIC chunk header according to oneembodiment of the present invention.

In case that a wake-up indicator is ignored by a user, it is necessaryfor the broadcasting receiver to ignore a repetitive transmission for anidentical wake-up event

The FIC Chunk header may include a FIC_chunk_major_protocol_versionfield, a FIC_chunk_minor_protocol_version field, aFIC_chunk_header_extension_length field, anensemble_loop_header_extension_length field, anMH_service_loop_extension_length field, a current_next_indicator field,a transport_stream_id field, an EAS_wake_up_extended_info field, anEAS_wake_up_extended_info_Tag field, an EAS_wake_up_version_numberfield, and/or a num_ensembles field.

The FIC_chunk_major_protocol_version field indicates a major version fora syntax of a FIC Chunk. A change of a major level indicates a syntaxchange of the FIC Chunk in a range that a backward compatibility is notmaintained.

The FIC_chunk_minor_protocol_version field indicates a minor version fora syntax of the FIC Chunk. A change of a minor level indicates a syntaxchange of the FIC Chunk in a range that a backward compatibility ismaintained. According to one embodiment of the present invention, theFIC_chunk_minor_protocol_version field may be able to indicate that awake-up signaling extension for an emergency alert system exists in theFIC Chunk.

The FIC_chunk_header_extension_length field indicates a length of fieldsextended in the FIC Chunk header by the change of the minor level of thesyntax of the FIC Chunk. The FIC_chunk_header_extension_length field maybe able to indicate a length of a field extended by a wake-up signalingextension.

The ensemble_loop_header_extension_length field indicates a length of anextension field of the header of the num_ensemble loop in the FIC Chunkpayload added by the change of the minor level of the syntax of the FICChunk.

The MH_service_loop_extension_length field indicates a length of anextension field of num_MH_services loop entry in the FIC Chunk payloadadded by the change of the minor level of the syntax of the FIC Chunk.

The current_next_indicator field indicates whether the FIC chunk isapplicable to a current MH frame or a next MH frame.

The transport_stream_id field performs a role of a label to identify amobile broadcasting.

The EAS_wake_up_extended_info field includes information on a fieldextended for a wake-up function.

The EAS_wake_up_extended_info_Tag field indicates a type of extended FICChunk header. For instance, the EAS_wake_up_extended_info_Tag field maybe able to indicate a size of a field extended for a wake-up function.

The EAS_wake_up_version_number field indicates a version information ofa wake-up signaling.

The num_ensembles field indicates the number of ensemble transmitted viaa physical transport channel in relation to the FIC Chunk.

FIG. 12 is a diagram of a procedure processing a version information ofa wake-up signaling via an extension of a FIC chunk header according toone embodiment of the present invention.

The broadcasting receiver monitors the FIC_version field included in theTPC. In case that the FIC_version field is modified, the broadcastingreceiver checks the FIC segment header. If the wake_up_indicator fieldindicates that a wake-up function is needed to be performed, thebroadcasting receiver receives the FIC Chunk and checks theFIC_chunk_minor_protocol_version field and/or theFIC_chunk_header_extension_length field. If theFIC_chunk_minor_protocol_version field indicates that there exists achange in the FIC Chunk for the wake-up signaling, the broadcastingreceiver parses the FIC_chunk_header_extension_length field. If theFIC_chunk_header_extension_length field indicates that there exists anextension of the FIC Chunk header for the wake-up signaling, thebroadcasting receiver checks the EAS_wake_up_extended_info field in theFIC Chunk header. The broadcasting receiver confirms an extended fieldvia the EAS_wake_up_extended_info_Tag field and judges whether there isa change in the version of the wake-up signaling via theEAS_wake_up_version_number field. If there exists a change in theversion of the wake-up signaling, the broadcasting receiver checks theEAT_ensemble_indicator field in the FIC Chunk payload and obtains themobile emergency alert table from the ensemble transmitting the mobileemergency alert table. The broadcasting receiver processes the emergencyalert system using the obtained mobile emergency alert table.

FIG. 13 is a diagram of a procedure processing an auto tuning to asignificant emergency alert of a wake-up operation according to oneembodiment of the present invention.

In case that an auto tuning information is provided, the broadcastingreceiver may be able to provide the auto tuning to a significantemergency alert as a part of the wake-up operation.

The broadcasting receiver monitors the FIC_version field included in theTPC. In case that the FIC_version field is modified, the broadcastingreceiver checks the FIC segment header. If the wake_up_indicator fieldindicates that a wake-up function is needed to be performed, thebroadcasting receiver receives the FIC Chunk and checks the version ofthe wake-up signaling. If there is a change in the version of thewake-up signaling, the broadcasting receiver receives an ensembleincluding the mobile emergency alert table. If the fields included in anautomatic_tuning_info field in the mobile emergency alert table indicatethat an automatic tuning to a different channel is needed, a tuning to afrequency of a target of the automatic tuning is performed. Thebroadcasting receiver obtains an ensemble from the correspondingfrequency and executes the emergency alert system using the mobileemergency alert table included in the ensemble.

FIG. 14 is a diagram of a FLUTE FDT (File Delivery Table) instanceaccording to one embodiment of the present invention.

According to one embodiment, it is necessary to modify the FDT instanceto permit 0 file to be transmitted via a FLUTE session transmitting anNRT file.

An element of the FLUTE FDT instance transmitted in an NRT broadcastingservice for an emergency alert follows a content of OMA BCAST.

FIG. 15 is a diagram of a TPC syntax for a wake-up signaling using a TPCaccording to a different embodiment of the present invention.

According to a different embodiment a wake_up_indicator and awake_up_version_number can be added to the TPC data. In this case, thebroadcasting receiver may be able to judge whether to perform a wake-upfunction for an emergency alert with the TPC data only. In doing so, itmay be able to reduce battery consumption compared to the wake-upfunction performed using the aforementioned FIC Chunk. In particular,since it is not necessary for the broadcasting receiver to complete theFIC Chunk by gathering the FIC segment, the aforementioned operation canbe omitted, thereby reducing the battery consumption.

According to one embodiment of the present invention, the wake-upfunction can be performed by adding the wake_up_indicator and thewake_up_version_number information to the TPC data (TransmissionParameter Channel data) described in ATSC A/153 Part 2. Hence, althougha part of the fields included in the TPC is omitted in FIG. 15, it mayrefer to the ATSC A/153 Part 2. And, the field not having a separateexplanation among the field included in the TPC depicted in FIG. 15 mayrefer to the content written in the ATSC A/153 Part 2.

The TPC data may include the wake_up_indicator field, and/or thewake_up_version_number field.

The wake_up_indicator field assigns 1 bit using a legacy reserved bit.The wake_up_indicator field indicates whether the broadcasting receiverperforms the wake-up function. For instance, if a value of thewake_up_indicator field corresponds to ‘0’, the broadcasting receivershould perform the wake-up function in case that the broadcastingreceiver is in a standby mode. If the value of the wake_up_indicatorfield corresponds to ‘1’, the broadcasting receiver maintains a formerstate. In particular, the broadcasting receiver can be controlled tocontinuously monitor the TPC in case that the broadcasting receiver isin a standby mode and can be controlled to continuously play an A/V incase that the broadcasting receiver was playing the A/V.

The wake_up_version_number field indicates a version information of awake-up signaling. The broadcasting receiver may be able to judgewhether it is a new wake-up before the broadcasting receiver receives aFIC in a manner of switching from a standby mode to an active mode bycomparing a value of the wake_up_version_number field with apre-received value of the wake_up_version_number field.

FIG. 16 is a diagram of a syntax of a FIC segment header according to adifferent embodiment of the present invention.

According to a different embodiment of the present invention, the mobilebroadcasting receiver may be able to correspond to two wake-ups byassigning 2 bits to the wake_up_indicator included in the FIC segmentheader.

The content of syntax of the FIC segment header is substituted with theaforementioned content.

There exists very low possibility of occurrence of a disaster strongenough to perform a wake-up. In case that one wake-up (wake-up 1) isdelivered to a receiver, the receiver may be turned on by force and auser may be able to terminate the wake-up 1 by force while watching aprogram. In this case, a wake-up signaling corresponding to the samewake-up 1 can be continuously transmitted. In this case, thebroadcasting receiver may be able to judge whether the wake-up signalingcorresponds to a wake-up delivered after the user terminated by forceusing the wake_up_indicator field of 2 bits. In particular, in case oftransmitting a signaling of wake-up 2 due to a strong disastercorresponding to the wake-up 2 delivered afterward, it is possible toturn the broadcasting receiver on again by force. Therefore, it may benecessary to have a function of distinguishing between a previouslyreceived wake-up and a newly received wake-up in a manner of assigning 2bits to the wake_up_indicator field.

FIG. 17 is a diagram of an ESG content fragment according to a differentembodiment of the present invention.

According to a different embodiment of the present invention, anemergency alert system does not use an NRT service different from eachother for each emergency alert message and may be able to use anidentical NRT service for all of the emergency alert messages. In thiscase, the ESG content fragment may be able to include a new element tofind out that each of NRT contents is related to which message.

The ESG content fragment according to a different embodiment of thepresent invention may include an EAS_Content_message_ID field, and/or anEAS_Content_message_TAG field.

The EAS_Content_message_ID field may be able to have a same value withan ID of the emergency alert message specified in a mobile emergencyalert table.

The EAS_Content_message_TAG field corresponds to a usable value when anNRT list is shown. For instance, if the emergency alert message is abouta ‘typhoon’, a TAG may have such a value as a ‘typhoon alert’. This TAGvalue is assigned to an ESG server installed in a local station.

FIG. 18 is a diagram of an emergency alert system according to oneembodiment of the present invention.

A PBS (Public broadcasting Service) brings an emergency alert messagefrom an IPAWS (integrated Public Alert and Warning System)-OPEN via aSecure Line and then sends a corresponding message to a local PBSstation via a satellite network. The emergency alert message sent to thelocal PBS station is made into a mobile emergency alert table in an MDTV(Mobile Digital television) signaling server and then transmitted to anMDTV network via a multiplexer and an exciter.

If an MDTV receiver receives this signal, the MDTV receiver parses themobile emergency alert table using a signaling decoder and extracts atext of the emergency alert message to be displayed in a screen in amanner of parsing the emergency alert message existing inside of themobile emergency alert table.

A flow of additional information on the emergency alert message via theNRT can be performed as follows.

As a first method, the local PBS station makes additional informationfiles related to a disaster and stores the files in an NRT file storageused by an MDTV NRT server. The MDTV NRT server forms a signalinginformation related to the files stored in the NRT file storage and thentransmits the files in Non-Real-Time. The files are also delivered viathe MDTV network using the multiplexer and the exciter. The broadcastingreceiver receives the files in a manner of figuring out the informationon the files transmitted to the NRT using a FLUTE/ESG function and thenmay be able to display them in a screen of the broadcasting receiver.

Or, as a second method, the NRT file is not generated at each of thelocal PBS stations but transmitted by including URI informationindicating additional information inside of a CAP message when theIPAWS-OPEN gives an emergency alert message. In this case, <uri>element, which is a sub element of <resource> element of CAP, can beused. The MDTV signaling server may be able to bring a resource file byextracting the URI information of the CAP message and then transmits theresource file via the MDTV network using the NRT. The flow proceedingafter this is identical to the aforementioned method.

A recipient of an emergency alert message of a mobile emergency alertsystem can be divided into a public and a non-public. A non-public usercan be defined as a first responder. The non-public user refers to thepeople have an ability to process each of the disasters. For instance,in case of fire, 911 may correspond to the first responder. The mobileemergency alert table defines a type of receiver/recipient to which anemergency alert message should be delivered and also defines whichdiscipline is applied to deliver the emergency alert message in casethat a recipient corresponds to the first responder. The content on thisis substituted with the aforementioned content.

FIG. 19 is a diagram of a screen providing additional information of anemergency alert message using an NRT according to one embodiment of thepresent invention.

As mentioned in the foregoing description, in a mobile emergency alertsystem, a broadcasting receiver may be able to display additionalinformation related to a disaster using files transmitted inNon-Real-Time. A plurality of emergency alert messages can besimultaneously transmitted by the mobile emergency alert system. In thiscase, there may exist NRT additional information different from eachother for each of the emergency alert messages. In a mobile NRTenvironment, all informations related to the NRT can be included in anESG. Hence, all MDTV receivers should have an ESG function and theadditional information can be displayed to a user after the ESG isupdated. After updating the ESG, the MDTV receiver displays each of theNRT services in a screen in a manner of reading each of the NRT servicesfrom a service fragment of the ESG. Referring to FIG. 19, in case thattwo emergency alert messages for a Hurricane and a Typhoon are sent, theservice fragment of the ESG reading from a receiver to show a list ofthe NRT service related to each of the messages is disclosed. Theinformation indicated by the name of each fragment can be provided asadditional information of the emergency alert message.

FIG. 20 is a diagram of a screen providing additional information of anemergency alert message using an NRT according to a different embodimentof the present invention.

If a user selects a service from a list of the NRT service related tothe emergency alert message, the receiver may be able to display a listof the content related to the service. The information related to thecontent can be transmitted in a manner of being included in the ESG TheNRT content information is recorded in a content fragment of the ESG andthe receiver may be able to display a list of information on a name ofthe content, and/or an expiration data, etc. by searching for contentitems that reference the service selected by the user.

Each of NRT files providing additional information of the emergencyalert message is transmitted to the broadcasting receiver via the FLUTEand stored in the storage inside of the broadcasting receiver. If theuser wants to see the corresponding additional information, thebroadcasting receiver displays the corresponding additional informationby reading a corresponding file.

FIG. 21 is a diagram of an UI of a mobile emergency alert systemaccording to one embodiment of the present invention.

Since a text of an emergency alert message is sent via a mobileemergency alert table, a mobile broadcasting receiver displays theemergency alert message after completing an extraction job for theemergency alert message in a manner of receiving related signalinginformation.

In order to show additional information of the emergency alert message,the mobile broadcasting receiver may be able to display a menu in amanner of generating the menu with a name of EAS. In case that thereexist a plurality of NRT services, the mobile broadcasting receivershows an NRT service list related to an emergency alert when a userselects the EAS menu. If the user selects a service, the mobilebroadcasting receiver displays a content list related to the service ina screen in a manner of constructing with informations on a name,expiration data, and/or a file reception status, and the like. Referringto FIG. 21, in case that the user selects an evacuation map in thecontent list, a corresponding map is displayed in the screen.

FIG. 22 is a diagram of a syntax of a mobile emergency alert tableaccording to a different embodiment of the present invention.

If there does not exist a parser capable of parsing an emergency alertmessage file in a mobile broadcasting receiver, it may be unable tointerpret the information included in the corresponding file. Yet, it isnecessary to deliver an emergency alert message to the correspondingmobile broadcasting receiver even in the aforementioned situation.

A mobile emergency alert table according to a different embodiment ofthe present invention may include an event_code field, an event_urgencyfield, an event_severity field, an event_certainty field, anEAS_message_type field, a num_referenced_messages field, areferenced_message_id field, an event_expiry_time field, a num_geo_codefield, a geo_code field, an alert_text_length field, and/or analert_text( ) descriptor.

The event_code field indicates a code for an event related to anemergency alert message.

The event_urgency field indicates an extent of urgency of a response foran event related to an emergency alert message.

The event_severity field indicates an extent of severity of an eventrelated to an emergency alert message.

The event_certainty field indicates an extent of certainty of an eventrelated to an emergency alert message.

The EAS_message_type field indicates a type of an emergency alertmessage.

The num_referenced_messages field indicates the number of messagereferenced by a current emergency alert message among the emergencyalert messages already transmitted.

The referenced_message_id field indicates an ID of an emergency alertmessage referenced by a current emergency alert message.

The event_expiry_time field indicates an expiry time of informationincluded in an emergency alert message.

The num_geo_code field indicates the number of code indicating a regionaffected by an emergency alert message.

The geo_code field indicates a code indicating a region affected by anemergency alert message.

The alert_text_length field indicates a length of a text of an emergencyalert.

The alert_text( ) field indicates a text of an emergency alert. Or, thealert_text( ) can be defined as a form of a descriptor. In this case,the alert_text( ) can be defined as the descriptor including additionalinformation on the text of the emergency alert.

Explanation on the different fields, not having a separate explanationamong the fields included in the mobile emergency alert table depictedin FIG. 22, is substituted with the aforementioned explanation on oneembodiment of the present invention.

According to a different embodiment of the present invention, bydefining a new table including information itself specified in anemergency alert message file and transmitting the table, a broadcastingreceiver may be able to use an emergency alert message even though thebroadcasting receiver does not have a parser of the emergency alertmessage file.

FIG. 23 is a diagram of a definition for a value available to anevent_urgency field, an event_severity field, an event_certainty field,and an EAS_message_type field according to a different embodiment of thepresent invention.

The event_urgency field may be able to indicate a case that an emergencyalert indicates about a past event, a case that the emergency alertindicates about a future event, a case that the emergency alertindicates about a current event, or a case that the emergency alertindicates an unknown of the extent of urgency of a corresponding eventindicated by the emergency, according to a value of this field.

The event_severity field may be able to indicate a case that theseverity of an event of an emergency alert is low, a case that theseverity of an event of an emergency alert is middle, a case that theseverity of an event of an emergency alert is severe, a case that theseverity of an event of an emergency alert is extremely severe, or acase that the severity of an event of an emergency alert is unknown,according to a value of this field.

The event_certainty field may be able to indicate a case that apossibility of occurrence of an event related to an emergency alert isvery low, a case that a possibility of occurrence of an event related toan emergency alert is intermediate, a case that a possibility ofoccurrence of an event related to an emergency alert is high, a casethat an event related to an emergency alert is currently observed, or acase that a possibility of occurrence of an event related to anemergency alert is unknown, according to a value of this field.

The EAS_message_type field may be able to indicate a case that atransmitted emergency alert message is an emergency alert message for anew event, a case that a transmitted emergency alert message is amessage updating the message having a specific referenced_message_idvalue among the previously transmitted messages, a case that atransmitted emergency alert message is an emergency alert messagecancelling the message having a specific referenced_message_id value, acase that a transmitted emergency alert message is a response message inresponse to a specific request, a case that a transmitted emergencyalert message has an error, or a case that a kind of a transmittedemergency alert message is not identified.

FIG. 24 is a diagram of a mobile emergency alert table according to adifferent embodiment of the present invention.

An emergency alert message should be precisely delivered to a regionaffected by an event related to an emergency alert. Hence, it isnecessary for a broadcasting receiver to review the suitability of acorresponding message before parsing a transmitted emergency alertmessage.

The mobile emergency alert table according to a different embodiment ofthe present invention may include a num_FIPS_codes field, a FIPS_codesfield, an EAS_event_code field, a content_coding field, a content_typefield, and/or an NRT service id filed.

The num_FIPS_codes field indicates the number of FIPS code indicating aregion affected by an emergency alert message.

The FIPS_codes field indicates a code indicating a region affected by anemergency alert message. The value of a corresponding field can beexpressed by the FIPS code.

The EAS_event_code field indicates a code for an event related to anemergency alert message. A corresponding field can be expressed by 3characters encoded by UTF-8.

The content_coding field indicates an encoding scheme of an emergencyalert message. The content_coding field may be able to indicate a casethat the emergency alert message is a plane text or a case that theemergency alert message is compressed by gzip, according to a value ofthis field.

The content_type field indicates a type of an emergency alert message.The content_type field may be able to indicate a case that the emergencyalert message is the emergency alert message used by CMAS or a case thatthe emergency alert message follows a criterion of a CAP.

The NRT_service_id filed identifies an NRT service including anemergency alert message or additional information on the emergency alertmessage.

Explanation on the different fields, not having a separate explanationamong the fields included in the mobile emergency alert table depictedin FIG. 24, is substituted with the aforementioned explanation on adifferent embodiment of the present invention.

According to a different embodiment of the present invention, since abroadcasting receiver is able to review whether a transmitted emergencyalert message is a message suitable for a region at which thebroadcasting receiver is positioned before the message is parsed, onlythe emergency alert message necessary for a viewer can be delivered tothe viewer. And, in case that the emergency alert message is notappropriated for a corresponding region, the broadcasting receiver maybe able to reduce unnecessary processing procedure.

FIG. 25 is a diagram of a mobile emergency alert table according to adifferent embodiment of the present invention.

In order to transmit the content related to an emergency alert messagevia an NRT service, related information on the NRT service is defined inthe SMT in general. Yet, it is necessary to have a method of accessingthe NRT service providing the content related to the emergency alertmessage even in a case that the SMT is not available.

The mobile emergency alert table according to a different embodiment ofthe present invention may include an NRT_service_IP_address_flag field,and/or an SG_bootstrap_data( ) field/descriptor.

The NRT_service_IP_address_flag field indicates whether there exists IPinformation related to the NRT service providing additional content foran emergency alert message.

If the NRT_service_IP_address_flag field indicates that the IPinformation related to the NRT service transmitting additional contentfor an emergency alert message exists, the SG_bootstrap_data( ) fieldmay be able to define a syntax including the IP information necessaryfor obtaining the NRT service. The SG_bootstrap_data( ) may be able toinclude the syntax including the IP information necessary for obtainingthe NRT service in a manner of being defined by a descriptor form. Itmay be able to include a syntax when SG_delivery_network_type defined byATSC A/153 Part 3 corresponds to ‘0*02’.

According to a different embodiment of the present invention, it is ableto access the NRT service providing additional information on anemergency alert message without using the SMT.

FIG. 26 is a diagram of a descriptor to signal an emergency alertservice via an extension of SMT according to one embodiment of thepresent invention.

A disaster alert service can be transmitted by such an individualservice as an A/V service in one ensemble. In this case, it is necessaryto perform a signaling for the disaster alert service in the SMT.

A descriptor for signaling an emergency alert service according to oneembodiment of the present invention may include a descriptor_tag field,a descriptor_length field, a priority_level field, anEAS_message_sent_type field, an IP_address field, an UDP_port_num field,and/or a service_related_nrt_service_id field.

The descriptor_tag field indicates that a corresponding descriptor is adescriptor for a disaster alert service.

The descriptor_length field indicates a total length of a correspondingdescriptor after a corresponding field.

The priority_level field indicates the extent of significance of anemergency alert message. The priority_level field may be able toindicate a case that the emergency alert message is a message to beprocessed preferentially, a case that the emergency alert message is amessage to be processed according to a general process procedure, or acase that a method of a processing the emergency alert message is notdefined, according to a value of this field.

The EAS_message_sent_type field indicates a type of transmission of anemergency alert message. The EAS_message_sent_type field may be able toindicate a case that the emergency alert message is transmitted via aseparate table, i.e., a mobile emergency alert table, a case that amethod of transmitting the emergency alert message is not defined, or acase that the emergency alert message is transmitted via an IP datagram,according to a value of this field.

The IP_address field indicates an IP address of an IP datagram includingan emergency alert message, if the EAS_message_sent_type field indicatesthat the emergency alert message is transmitted via the IP datagram.

The UDP_port_num field indicates a port number of an UDP/IP streamtransmitting an IP datagram including an emergency alert message, if theEAS_message_sent_type field indicates that the emergency alert messageis transmitted via the IP datagram.

The service_related_nrt_service_id field indicates an ID of an NRservice transmitting the content related to an emergency alert messagetransmitted.

A descriptor according to one embodiment of the present invention can beincluded in a region for the descriptor included in the SMT. In thiscase, the SMT can be explained with reference to a type written in ATSCA/153.

FIG. 27 is a diagram of a descriptor to signal an emergency alertservice according to a different embodiment of the present invention.

A descriptor for signaling an emergency alert service can be defined inan ensemble level.

The descriptor for signaling the emergency alert service according to adifferent embodiment of the present invention may include anIP_version_flag field, and/or an ensemble_related_nrt_service_id field.Explanation on the different fields included in the present descriptionis substituted with the explanation on the aforementioned fields of thedescriptor.

The IP_version_flag field indicates an IP address type of an IP datagramincluding an emergency alert message, if the EAS_message_sent_type fieldindicates that the emergency alert message is transmitted via the IPdatagram. The IP_version_flag field may be able to indicate that the IPaddress type of the IP datagram uses an IPv4 type or an IPv6 addresstype according to a value of this field.

The ensemble_related_nrt_service_id field indicates an ID of an NRTservice transmitting the content related to an emergency alert messagetransmitted.

According to the present invention, by signaling an emergency alertservice in a manner of defining a descriptor in one ensemble, it may beable to avoid a phenomenon that the SMT increases in size.

FIG. 28 is a diagram of a signaling to provide an emergency alertservice with one component according to one embodiment of the presentinvention.

It may be able to transmit an emergency alert service by one componentas well as a service or an ensemble level. In this case, a new M/Hcomponent descriptor can be defined in a manner of adding a definitionof a new component and extracting fields practically used from the FLUTEcomponent data.

The component_type field may be able to indicate that the M/H componentis a component for an emergency alert service.

A TSI field of the MH_component_data( ) descriptor can be defined. Inthis case, the TSI field indicates an identifier for a transport sessionof FLUTE session, which transmits NRT content.

According to the present invention, in case that an emergency alertservice is transmitted by M/HI component, since an unnecessary field isnot transmitted, it may be able to avoid a phenomenon that datatransmission increases for signaling SMT or ensemble level.

FIG. 29 is a diagram of emergency_alert_IP_datagram ( ) descriptor totransmit an emergency alert service according to one embodiment of thepresent invention.

In order for a receiver to normally analyze the data, which is relatedto an emergency alert service transmitted via an IP datagram, thecorresponding data should have a certain type. Hence, configuring asyntax as shown in FIG. 29 corresponds to one embodiment of the presentinvention.

An IP_header field indicates an IP header of the IP datagram.

An UDP_header field indicates an UDP header of the IP datagram.

A payload_type_indicator field indicates a payload type of the IPdatagram for transmitting an emergency alert message. Thepayload_type_indicator field may be able to indicate a case that thepayload of the IP datagram includes a separate syntax including theinformation of the emergency alert message, a case that the payload ofthe IP datagram includes the emergency alert message file itself, or acase that a kind of the payload of the IP datagram is not defined,according to a value of this field.

According to one embodiment, if the payload_type_indicator fieldindicates that the payload of the IP datagram includes a separate syntaxincluding the information of the emergency alert message, the payload ofthe IP datagram may be able to include a table of a prescribed formamong the aforementioned mobile emergency alert tables.

FIG. 30 is a diagram of emergency_alert_IP_datagram( ) descriptor totransmit an emergency alert service according to a different embodimentof the present invention.

If the payload_type_indicator field indicates that the payload of the IPdatagram includes the emergency alert message file itself, the payloadof the IP datagram may be able to include a text and/or a compressedemergency alert message file(s). In this case, the payload includes aseries of a message_header and a set of a message_body. Themessage_header, as shown in FIG. 30, may be able to include detailinformation on the message_body (a message_body_length, amessage_gzipped_flag, and the like).

An emergency_alert_IP_datagram( ) descriptor according to a differentembodiment of the present invention may include the message_body_lengthfield and/or the message_gzipped_flag field.

The message_body_length field indicates a length of the message_body.The length of the message_body cannot be greater than the total lengthof the IP datagram.

The message_gzipped_flag field indicates whether a compressed emergencyalert message is included in the message_body. The message_gzipped_flagfield may be able to indicate that the emergency alert message includedin the payload is compressed by gzip, according to a value of thisfield.

Explanation on the different fields included in theemergency_alert_IP_datagram( ) descriptor is substituted with theexplanation on the aforementioned emergency_alert_IP_datagram( )descriptor.

FIG. 31 is a diagram of an ESG content fragment for an emergency alertservice according to a different embodiment of the present invention.

As mentioned in the foregoing description, content related to anemergency alert message can be transmitted via NRT service. In thiscase, the content transmitted via the NRT service may be able to deliverdetail information via the content fragment of the ESG

The ESG content fragment may include an emergency element and/or aweight element.

The emergency element indicates whether a corresponding content isrelated to an emergency alert situation. For instance, in order toindicate that this content is related to the emergency alert situation,a value of the emergency element can be set to ‘true’.

The weight element determines a display order of the contents, whichbelong to an identical service. For instance, as the value of acorresponding element is lower, a corresponding content can bepreferentially displayed in a screen. Hence, in order to preferentiallydisplay content in the screen, the value of the weight element should beset low. In case of the content displayed in the screen of a receiver byforce, the value of this element can be set to ‘0’.

The elements not explained in FIG. 31 can be supplemented with referenceto the content related to the ESG of ATSC.

According to the present invention, a broadcasting receiver may be ableto perform a prompt processing on the content related to an emergencyalert message using ESG content fragment.

For clarity of explanation, each diagram is explained in a manner ofbeing divided. Yet, it is possible to design a new embodiment toimplement the new embodiment by combining the embodiments, which aredescribed in each of the diagrams. And, according to the necessity ofthose skilled in the art, designing a recording media readable by thecomputer, which has recorded a program for executing the previouslyexplained embodiments, also belongs to a scope of a right.

A method and apparatus according to the present invention may notlimitedly apply to the composition and method of the aforementionedembodiments. The aforementioned embodiments may be configured in amanner of being selectively combined the whole of the embodiments or apart of the embodiments to achieve various modifications.

Meanwhile, a method of processing a video can be implemented with a codereadable by a processor in a recording media readable by the processor,which is equipped in a network device. The recording media readable bythe processor may include all kinds of recording devices for storingdata capable of being read by the processor. The examples of therecording media readable by the processor may include a ROM, a RAM, aCD-ROM, a magnetic tape, a floppy disc, an optical data storing deviceand the like. And, implementing in a form of a carrier wave such as atransmission via an internet and the like is also included. Therecording media readable by the processor are distributed to thecomputer systems connected by a network and codes readable by theprocessor can be stored and executed in a manner of being distributed.

While the present specification has been described and illustratedherein with reference to the preferred embodiments and diagrams thereof,the present specification may be non-limited to the aforementionedembodiments and it will be apparent to those skilled in the art thatvarious modifications and variations can be made therein withoutdeparting from the spirit and scope of the present specification. Thus,it is intended that the present specification covers the modificationsand variations of this invention that come within the scope of theappended claims and their equivalents.

And, both an apparatus invention and a method invention are explained inthe present specification and the explanation on the both of theinventions can be complementally applied, if necessary.

MODE FOR INVENTION

As mentioned in the foregoing description, the related is described inthe best mode for invention

INDUSTRIAL APPLICABILITY

The present invention can be applied to a whole of a mobile broadcastingindustry.

What is claimed is:
 1. A method of providing an emergency alert in abroadcast transmitter, the method comprising: generating service data ofa broadcast service; generating an emergency alert table including anemergency alert message; generating an additional content related to theemergency alert message; generating wake-up information indicatingwhether a broadcast receiver is to be woken up; and transmitting abroadcast signal including the service data, the emergency alert table,the additional content, and the wake-up information, wherein theemergency alert table further includes information for identifying aviewing target for the emergency alert message and emergency-relatedbroadcast service information for an emergency-related broadcastservice, wherein the emergency-related broadcast service informationincludes information for identifying the emergency-related broadcastservice and information for identifying a broadcast stream deliveringthe emergency-related broadcast service, wherein the wake-up informationindicates a wake-up call by being changed from 0 to 1, and wherein thewake-up information indicates a different wake-up call from the wake-upcall by being changed from 1 to
 2. 2. The method of claim 1, wherein theadditional content includes content files that provide additionalinformation about the emergency alert message.
 3. The method of claim 1,wherein the wake-up information is represented by at least 2 bits. 4.The method of claim 1, wherein the broadcast receiver in a standby modewakes up only for the wake-up call for the corresponding emergency. 5.An apparatus for providing an emergency alert as a broadcasttransmitter, the apparatus comprising: a generator that generatesservice data of a broadcast service, an emergency alert table includingan emergency alert message, an additional content related to theemergency alert message and wake-up information indicating whether abroadcast receiver is to be woken up; and a transmitting unit thattransmits a broadcast signal including the service data, the emergencyalert table, the additional content, and the wake-up information,wherein the emergency alert table further includes information foridentifying a viewing target for the emergency alert message andemergency-related broadcast service information for an emergency-relatedbroadcast service, wherein the emergency-related broadcast serviceinformation includes information for identifying the emergency-relatedbroadcast service and information for identifying a broadcast streamdelivering the emergency-related broadcast service, wherein the wake-upinformation indicates a wake-up call by being changed from 0 to 1, andwherein the wake-up information indicates a different wake-up call fromthe wake-up call by being changed from 1 to
 2. 6. The apparatus of claim5, wherein the additional content includes content files that provideadditional information about the emergency alert message.
 7. Theapparatus of claim 5, wherein the wake-up information is represented byat least 2 bits.
 8. The apparatus of claim 5, wherein the broadcastreceiver in a standby mode wakes up only for the wake-up call for thecorresponding emergency.
 9. A method of processing an emergency alert ina broadcast receiver, the method comprising: receiving a broadcastsignal including service data of a broadcast service and an emergencyalert table including an emergency alert message; receiving anadditional content related to the emergency alert message; decoding theservice data in the received broadcast signal; decoding the emergencyalert table in the received broadcast signal; displaying the broadcastservice including the decoded service data and displaying the emergencyalert message in the decoded emergency alert table; and displaying theadditional content related to the emergency alert message according to arequest of a user, wherein the emergency alert table further includesinformation for identifying a viewing target for the emergency alertmessage and emergency-related broadcast service information for anemergency-related broadcast service, wherein the emergency-relatedbroadcast service information includes information for identifying theemergency-related broadcast service and information for identifying abroadcast stream delivering the emergency-related broadcast service,wherein the received broadcast signal further includes wake-upinformation indicating whether the broadcast receiver is to be woken up,wherein the wake-up information indicates a wake-up call by beingchanged from 0 to 1, and wherein the wake-up information indicates adifferent wake-up call from the wake-up call by being changed from 1 to2.
 10. The method of claim 9, further comprising: changing the broadcastservice that is displaying into the emergency-related broadcast service;and displaying the changed emergency-related broadcast service.
 11. Themethod of claim 9, wherein displaying the additional content related tothe emergency alert message further comprises: displaying a list of twoor more additional contents according to the request of the user whenthere are the two or more additional contents related to the emergencyalert message; selecting one of the two or more additional contents bythe user, and displaying the selected additional content element. 12.The method of claim 9, wherein the additional content includes at leastone of a video clip, a graphic, and a detailed description related tothe emergency alert message.
 13. The method of claim 11, whereindisplaying the additional content related to the emergency alert messagefurther comprises; displaying the list of the two or more additionalcontents when the display of the selected additional content is canceledaccording to the request of the user.
 14. The method of claim 9, whereinthe wake-up information includes at least 2 bits.
 15. A broadcastreceiver for processing an emergency alert, the broadcast receivercomprising: a receiver that receives a broadcast signal includingservice data of a broadcast service and an emergency alert tableincluding an emergency alert message; a first decoder that decodes theservice data in the received broadcast signal; a second decoder thatdecodes the emergency alert table in the received broadcast signal; anda display processor that displays the broadcast service including thedecoded service data and displays the emergency alert message in thedecoded emergency alert table, wherein the receiver further receives anadditional content related to the emergency alert message, wherein thedisplay processor further displays the additional content related to theemergency alert message according to a request of a user, wherein theemergency alert table includes information for identifying a viewingtarget for the emergency alert message and emergency-related broadcastservice information for an emergency-related broadcast service, whereinthe emergency-related broadcast service information includes informationfor identifying the emergency-related broadcast service and informationfor identifying a broadcast stream delivering the emergency-relatedbroadcast service, wherein the received broadcast signal furtherincludes wake-up information indicating whether the broadcast receiveris to be woken up, wherein the wake-up information indicates a wake-upcall by being changed from 0 to 1, and wherein the wake-up informationindicates a different wake-up call from the wake-up call by beingchanged from 1 to
 2. 16. The broadcast receiver of claim 15, wherein thedisplay processor displays the emergency-related broadcast service bychanging the broadcast service that is displaying into theemergency-related broadcast service.
 17. The broadcast receiver of claim15, wherein the display processor further displays a list of two or moreadditional contents according to the request of the user when there arethe two or more additional contents related to the emergency alertmessage, selects one of the two or more additional contents by the user,and displays the selected additional content.
 18. The broadcast receiverof claim 15, wherein the additional content includes at least one of avideo clip, a graphic, and a detailed description related to theemergency alert message.
 19. The broadcast receiver of claim 17, whereinthe display processor further displays the list of the two or moreadditional contents when the display of the selected additional contentis canceled according to the request of the user.
 20. The broadcastreceiver of claim 15, wherein the wake-up information includes at least2 bits.